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How often should I change the water in the aquarium

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How and how much to change the water in the aquarium, the frequency of water changes


How to change the water in the aquarium?

In this article we will discuss a fairly simple, but at the same time, a difficult question regarding the change of water in the aquarium. It is simple because there is no need to replace water in the aquarium. However, there are a lot of nuances and certain specifics that you need to know on this issue. The matter is further complicated by the lack of complete, comprehensive information on the Internet. As a rule, information about the change of water in an aquarium is either compressed, or one-sided, or only a certain part is covered.

No exception was our site. Here, for example, article Boiled, melted or distilled water for aquarium. It seems the article is good, but narrow and concise.

So let's fix this defect. As much as possible and fully consider the question: "How to change the water in the aquarium?" That in turn, will give us the opportunity to make the change of water as simple and effective as possible.

For convenience, let's break down the article into the following sections:

1. WHY DO I NEED TO CHANGE WATER IN THE AQUARIUM, DO I NEED TO DO IT AT ALL?

2. WHY FOR DEFINING AQUARIUM WATER?

3. HOW IS THE CORRECT AND HOW MUCH ON TIME DO I NEED TO LEAVE WATER FOR AQUARIUM?

4. WHAT TO DO IF A BIGGER NUMBER OF AQUARIUM WATER IS NECESSARY TO DECLINE? OTHER WAYS OF PREPARING WATER FOR THE AQUARIUM?

5. HOW OFTEN AND IN WHAT VOLUME DO I NEED TO REPLACE AQUARIUM WATER WITH FRESH?

6. THE RIGHT ORDER IS THE PROCESS OF CHANGING AQUARIUM WATER.

WHY DO I NEED TO CHANGE WATER IN THE AQUARIUM, DO I NEED TO DO IT AT ALL?

Many novice aquarists are faced with different opinions about the need to change the aquarium water. Often in the forums or from friends you can hear the phrase: "That I do not change the water at all and .... everything is OK" or "I rarely, rarely ... and also OK." Here that, at the beginner and there is a stupor! How so? I’ve furnished the whole balcony with buckets, how I carry a water carrier from the bathroom to the aquarium, but it turns out that this is “monkey work” !? Without tormenting for a long time, I will answer you - do not listen to these "uncles and aunts"! They mislead you. AQUARIUM WATER MUST BE CHANGED!

And the thing is this! In the process of vital activity of all aquatic aquatic organisms (inhabitants), the aquarium itself, or rather, the water becomes clogged. For example, an excess of food, fish feces, dead leaves of plants and other organic matter. All this "dirt" turns into the most terrible poison - ammonia, which is destructive for all living things in an aquarium. Further, the nitrifying bacteria that are in the water, the filter and the soil "decompose" ammonia to nitrite (poison), then nitrate ("weak" poison), and then the remains are converted to gaseous state and leave the water.

So, no matter how many useful nitrifying bacteria are in the aquarium of colonies, no matter how many live plants are in the aquarium, which also partially absorb ammonia, no matter how powerful the filters are ... no matter, the above poisons tend to accumulate. And you can bring them ONLY REGULAR REPLACEMENT OF WATER TO CLEAN.

What happens in an aquarium for those who do not change the water for a long time? Many aquarium fish tend to adapt and live in the worst conditions - get used to the poisons. However, this function of "survival in any conditions" is not eternal. In fish, irreversible changes occur in the internal organs, mucous membranes and gills. Fish weaken, their immunity falls. And the “Doomsday” comes when an outbreak of a bacterial, fungal or infusorian attack occurs ... not many survive!

In total, the change of aquarium water is one of the most important ways to maintain "health in the aquarium", one cannot do without it. Laziness in this matter is a fatal mistake!

WHY DRAIN AQUARIUM WATER?

HOW IS IT CORRECT TO DO IT?

There is such a non-contagious sore in fish, called Gas embolism. In a nutshell - this is the entry of small air bubbles into the blood vessels and blood of fish. As a result, there is a blockage of blood vessels. Fishes begin to swim sideways, the behavior becomes alarming, fearful. The fins and the whole body begin to tremble convulsively. The movement of the gill covers slows down, and then completely stops ... further death!

A frequent cause of gas emboli is inadequate settled water for an aquarium. The fact is that tap water (tap water) is excessively saturated with air bubbles that are so small that they are not even visible to the human eye. Just imagine how much water “poured through the pipes” until it reached your tap!

Thus, filling the tap water in an aquarium with fish - YOU ARE VERY RISK. Yes, in practice, everything can do, but this is a game of Russian roulette.

What happens to water if it is defended? What happens is that small bubbles gradually merge and come out of the water. Water saturation by air decreases, the risks are reduced to zero.

In addition, it is worth noting that in the process of settling water for the aquarium, heavy and harmful compounds, for example, chlorine as sediment at the bottom of the container and film on the surface of the water, settle.

HOW IS THE CORRECT AND HOW MUCH ON TIME DO I NEED TO LEAVE WATER FOR THE AQUARIUM?

Everything is simple and should not cause much difficulty. The water in the aquarium should settle in a container with a wide neck: a bucket, a basin, an enamel saucepan. You understand that in a bottle with a narrow neck, excess air goes out poorly. Container for sludge should not be metallic, rusty or made of toxic substances or paints. Plastic buckets, perhaps the best and easiest option for defending aquarium water.

About time! ... The longer the water settles, the better! I personally defend the water for 7 days - this is convenient and coincides with my Sunday schedule for changing the water in the aquarium. In general, such terms of water settling 1-14 days roam the Internet.

WHAT TO DO IF A LARGE AMOUNT OF WATER IS NECESSARY TO DECLINE? OTHER WAYS OF PREPARING WATER FOR THE AQUARIUM?

But this is really a problematic issue for owners of large aquariums and not large apartments! How to defend 50, and then 100 liters of water?

If this is a new aquarium and the first launch of the aquarium is made, you can immediately fill in the aquarium with tap water, defend it and at the same time add air conditioners to improve the quality of water.

If water is needed for replacement, then our first glance is the only rational option is to purchase construction containers (plastic buckets for mixing mixtures) for 50, 100 liters.

Other ways to prepare aquarium water in the first place include: boiling, freezing water, as well as its purchase of water in the store. See more about this. HERE.

Also, aquarium water can be prepared using special air conditioners such as: Tetra AquaSafe, AMMO-LOC, Sera aqutan and others.

Here is a video about one of them:

HOW OFTEN AND IN WHAT VOLUME DO I NEED TO REPLACE WATER IN THE AQUARIUM?

Almost in all books, on all sites, they write standardly what needs to be changed weekly? part of the water from the total volume of the aquarium. This is a generally accepted norm, BUT NOT DOGMA. Here, look, please statistics of the survey, which is conducted on our site.

How often do you change the aquarium water to fresh?

As you can see, everyone changes the water in different ways and the weekly replacement of aquarium water is not a dogma! Why? It's very simple - everyone has different aquariums, different fish, plants, and so on. For example, there are fish that love the "old" water and the frequent change of water only annoys them (the family of labyrinth fish). The abundance of living plants, also reduces pollution in the aquarium. In the end, someone has a large aquarium, someone has a small, someone has a big fish, and someone has a small one.

All this individual specificity of the content of fish excludes the concept dogma number and frequency of substitution of aquarium water. And there is only one advice - you should adapt yourself and you should come to the conclusion about how often and how much water you need to change in your aquarium. In this case, you must take into account the volume of the reservoir, the population of the aquarium, the individual characteristics of the fish, the presence or number of plants, the filter power, the presence of ion exchange resins in the filter, and so on.

THE RIGHT ORDER OF CHANGING AQUARIUM WATER

Finally, I want to give attention to the beginner aquarists, that it is only necessary to change the aquarium water after cleaning the aquarium, and not before.

That is, first we:
- clean the filter and other equipment;
- wipe the walls of the aquarium;
- we thin and cut the plants;
- siphon soil;
- produce other manipulations and permutations;
- and only then we replace part of the water with fresh one;

If you have any questions, any comments on the article, please leave them in the comments - we will discuss.

Useful video about changing aquarium water

How and when to change the water in the aquarium

Water for aquarium fish should be maintained in a constant composition, which will regulate the amount of organic impurities in it. Biological equilibrium can be achieved through filtration and regular water renewal. Proper renewal of water in an aquarium with fish is the key to their health and good life, because this procedure preserves the mini-ecosystem of the home nursery.

Types of replacement in an artificial reservoir

Replacing water in an aquarium is an indispensable component of its content. There are 2 types of water changes - partial change and full change.

  1. Partial replacement in a freshwater aquarium maintains the biological balance of the aquatic environment, despite the often changing composition of the fluid. Before changing the water, from the moment of its first launch, you need to wait two months. Correctly update the water 1-2 times a week, no more than 20-30% of the total. It is often dangerous to change water - it usually leads to deterioration of water quality and neutralization of beneficial microflora.

See how to make a partial replacement of water in the aquarium.

  1. Complete replacement of water is needed as a last resort - when all the aquarium fish are sick. One fish can be quarantined, in the case of disease of all residents of the nursery you want to change all the liquid. There are a number of drugs that help cure ailment, but they contain chemicals that pollute water, after which it will be unsuitable for life. In this case, a complete replacement of water is often a necessary measure, since even drugs cannot completely destroy the pathogenic microbes. Change all the water you need with a special device - aquarium hose, which is on the shelves of pet stores. When completely replacing the hose with a hose, siphon the bottom, cleaning it from contamination, and the glass container is washed with a special liquid to remove plaque. If you need to fight the disease - you will have to bring all the details back to normal, all the water updates are not enough.
  • Attention!

A complete water change is required during a scheduled restart.

Aquarium water: how to defend?

How many checks are needed to normalize the water in the aquarium? It rarely happens that tap water does not contain chlorine and phosphate compounds, and if so, then this is a lot of luck. You can purchase litmus paper at the pet store, using it to measure the acidity and hardness of water from the tap. Water in a small aquarium is easier to put in order than in a large one. Special components that increase or decrease water hardness can be found in stores or in your own home. In aquariums with a volume of more than 150 liters, you can replace 20% of the water yourself, without prior preparation.

How much time to defend the water? Everything depends on the type of fish that will settle in the reservoir, on their requirements, on the whimsical nature of aquatic plants - after all, the fish often live with plants, and they are almost indispensable. If it does not meet the pH level of 7.0, then it can be defended for 3-4 days until the chlorine and phosphate compounds evaporate.

Aquarium water: what you need to know about the big replacement?

A large water change is the renewal of a significant amount of fluid that occurs in stages over a period of 5-7 days. It is necessary to change such water when there is a need to lower the level of compounds accumulated in the water. Often after a big replacement, the fish become healthy and active. However, changing the contents of the reservoir is not recommended very often.


In a 100-liter aquarium with a small amount of vegetation, you can make the following replacement:

Drain 80 liters of old and add 40 liters of new water, add another 40 liters in a day. But this option is unacceptable for reservoirs where there is a lot of vegetation and fish. In this case, it is better to update 60% of the volume once.

Recommendations for replacing in saltwater aquariums

Sometimes you need to change the water in an aquarium with sea water, if it is in the house. Replacement should occur at elevated concentrations of nitrates and nitrites. Updating a saltwater aquarium does not go as it does in a freshwater aquarium. Properly used with distilled salt water or distilled through reverse osmosis liquid.

Whimsical hydrobionts and sea fish will not be able to live in tap water. Without prior, multi-phase filtering, it only hurts sentient beings. Replacing water 1 time per month (10-20%) of the total volume of the reservoir is not particularly effective with heavy pollution. In saltwater aquariums, it is better to replace a large amount of water.

See how to run a saltwater aquarium.

How to know that it is time to update the aquatic environment in a salt water tank?

How much time must pass to have to renew the aquatic environment in the marine tank again? The first is to check periodically observations and tests using reagents. The pure water dissolves salts that contain: MgSO4x7H20, sodium chloride, potassium bromide, MgCl2x6H2O, SrCl2x7H20, sodium carbonate, calcium chloride, potassium chloride, boric acid, sodium hydrosulfite (acid salt), sodium fluoride. These components are part of the artificial sea salt, which must be added over 3 days gradually, one after the other. But this option is very difficult for beginners. In order not to harm the fish and plants, there is a second way - to monitor the quality of the tank (whether there are greens in the water, foam, haze, droppings), its purity and smell.

Also make sure that the quality of the filter has not changed (both mechanical and biological). High-quality filtration prevents severe contamination, so there will be no need to completely change the fluid in the pond. A good filter restores the biological balance of the nursery, making it suitable for further use.

Replacing aquarium water

Water for aquarium fish must be supported by a certain composition, in which the proportion of substances from the decay of organic matter is regulated. Despite the fact that in many respects equilibrium is achieved through the use of filtration, it is necessary to carry out regular replacement of water. Deciding how to change the water in the aquarium, its owner must represent what kind of results he wants to achieve.

How to change the water in the aquarium

Replacing the water in the aquarium is an obligatory process for its maintenance. There are partial substitution and complete replacement of water.

Partial water change

Partial substitution in a freshwater aquarium is necessary to maintain the balance of the formed environment due to the fact that it evaporates and changes its composition. However, before changing the water in the aquarium, time should pass from the day of its launch: at least 2 months.

The frequency of partial replacement procedures is once every 1-2 weeks. Replace recommended 1/5 of the total.

Beginner aquarists face the question: how much to defend the water for the aquarium? If tap water does not contain chlorine and phosphates, then it can and not be defended. To check the presence of harmful substances should be tests. If these compounds are in tap water, then you can defend it for day 3. Also, the preparation of water for the aquarium can be carried out using special compositions to change the chemical composition of the water. With a sufficiently large volume of the aquarium (more than 150 liters) without special preparation, you can replace up to 20% of water in it.

Deciding what kind of water is needed for an aquarium when carrying out a partial substitution, should be guided by the capriciousness of the species of fish and plants that inhabit it.

Big substitution of water in several stages

The big substitution is the replacement of a significant amount of water in several stages during the week. Such a replacement of water in aquariums is used when you need to repeatedly reduce the level of substances accumulated in the water. After such a procedure, the fish become more active. But it should not be made too often.

How to change the water in the aquarium gradually, but in large volumes?

Consider the example of an aquarium in 100 liters. If there is little vegetation in it, such a change of water in the aquarium can be done as follows: drain 80 liters and add 40 liters of new water, and then after the remaining 40 liters.

For aquariums densely populated with fish or planted with algae, this option super-substitution is not acceptable: you can replace up to 60% of the total at one time.

It is convenient to use super substitution, which takes place in several stages. 60% of the volume of water in the aquarium is drained and only 30% is added, then half of the remaining is discharged and the same volume is added. The last manipulation is repeated 2 times, then add another 30% to the full volume of the aquarium. All stages of this super substitution take place in one week. At the same time, the concentration of harmful substances in water decreases to 8% of its initial volume.

Full replacement of water in the aquarium

Complete replacement of all water in established aquarium systems is extremely rare and in exceptional cases. It adversely affects its inhabitants: the leaves of plants grow brighter and die off more quickly, and some fish may die.

What water is needed for aquariums when it is completely replaced? Water should be prepared in advance, otherwise all the benefits of such a replacement will be leveled by a sharp change in pH-environment and water temperature, which, in turn, will be stress for fish. Therefore, for effective replacement of water it is often necessary to change its chemical composition.

How to change the water in aquariums with sea water

The main question for novice marine aquarists is how to change the water in an aquarium with sea water, without disturbing its composition. The main reason for its replacement: an increase in the concentration of nitrites and nitrates in water.

Replacing water in an aquarium with a marine bio-system is different from a freshwater aquarium. Firstly, if there are whimsical hydrobionts in the aquarium, it is recommended to take water either distilled or passed through reverse osmosis. There are aquarists who successfully use tap water to replace small amounts of water in fish aquariums. However, beginners should be aware that such a replacement is far from being possible for all types of marine fish and the water must be pre-filtered.

There are many discussions among non-professional owners of saltwater aquariums on how to change the water in aquariums with sea water. It is believed that the monthly substitution, which occurs in 5-20% of the water in the aquarium, does not give the desired effect if the aquarium is heavily polluted. But replacing large amounts of water destabilizes the balance. Therefore, the frequency of this process and the volume of water being replaced are determined by the efficiency of a particular aquarium. The need for an emergency replacement will be recognized by conducting regular water testing using tests.

The process of preparing water for the aquarium is simple. The purified water dissolves salts, which include: MgSO4x7H20, NaCI, KBr, MgCl2x6H2O, SrCl2x7H20, Na2CO3, CaCI2, KCI, H3BO3, NaHCO3, NaF. It lasts 3 days and it is better to add salts in a certain sequence.

Full replacement of water in the marine aquarium is carried out only as part of its restart.

How often should I change the water in the aquarium? and how often should I clean it completely? volume 50 liters

Katya Karishkina

After the aquarium is planted with plants and populated with fish, an amateur should strive to maintain. It has a steady regime. For the normal development of fish and the prevention of a number of diseases, a certain chemical composition and biological equilibrium, maintained for many years, are necessary in water. Water should be refilled as it evaporates, cleans the glass, the aquarium soil only partially, no more than 1/5 - 1/3 of the volume of the aquarium. Moreover, even a partial replacement of water should not drastically change both its gas and salt composition. In aquarium fish farming, complete replacement of old water is extremely rare. Even with the massive death of fish it does not completely change. When completely replacing the water, it is necessary to be sure that the new water meets all the hydrochemical parameters required for the existing fish species. Completely change the water in the aquarium in exceptional cases: when introducing unwanted microorganisms, the appearance of fungal mucus, rapid flowering of water that does not stop when the aquarium is darkened temporarily, and when the soil is very dirty. From the complete change of water plants suffer: there is discoloration and premature dying of the leaves. If the aquarium is biologically correctly populated, then plants, fish and bacteria in the soil and water can replace a good filter. A common opinion among novice aquarists about the need for frequent water changes as a prerequisite for the normal maintenance of exotic fish is deeply mistaken. Frequent changes of water in the aquarium can cause illness and even death of fish. In most cases, a water change — although a regular change of 1/5 of the water in an aquarium is always desirable — does not have a living stage of a room pond. This life in an aquarium, depending on our ability and desire, can last from several days to 10-15 years. What does that require? Replacing water by 1/5, up to certain limits, of course, (topping up with non-living tap water) will shake the equilibrium state of the environment, but after two days it will be restored. The larger the aquarium, the greater the resistance in it against our inept interventions. Replacing half of the medium will break the equilibrium stability, some fish and plants may die, but after a week the other homeostatism of the medium will again be restored. Replacing all the water with a plumbing can completely destroy the environment, and everything will have to start over.
If you decide to start an aquarium, and have not dealt with it before, but there is a desire to arrange everything not hastily and somehow, start with a small reservoir of 100-200 liters. It is just as easy to establish biological balance, to form a living environment, as in a small one, and to destroy it with its inept actions will be much more difficult than in an aquarium with a capacity of 20-30 liters. In an aquarium, we do not contain aquatic animals and plants, but aquatic habitats, and the main task of an aquarist is to maintain an equilibrium, healthy state of this particular environment, and not its individual inhabitants, because if the environment is healthy, then the inhabitants of this environment will be well . The habitat in the period of its formation (when plants were planted in the ground, and a week later the first fish were launched) is extremely unstable, therefore it is strictly prohibited to interfere with the work of the aquarium at this time. What do we have to do?
Within two months, it is impossible to replace water: what's the point, instead of semidiving water, which is just turning into residential water, to bring in a sterile water supply again? In a large aquarium, changing water will slow down the formation of the habitat, while in a small aquarium this intervention will cause a catastrophe and everything will have to start over. After two or three months, the emerging aquatic habitat in the aquarium will enter the youth stage. From this point until the complete reorganization of the aquarium, it is necessary to begin again to replace 1/5 of the volume of water once every 10 to 15 days, or monthly. It is as if the inhabitants of the aquarium do not need such a renewal of the environment, but the habitat requires it to prolong youth and maturity.

ello26

When the medium in the aquarium has stabilized, only partial replacements of no more than 20% of water every two to three weeks are made. But the aquarium lid should be thick enough so that the water does not evaporate so quickly. if the water evaporates quickly, it is better to change the water more often, so that the hardness does not increase.
I clean the aquarium after about three or four cleaning filters, about once every six weeks. Cleaning is the "sucking" of the soil through a tube (such a soil cleaner is sold). The shit is washed out, and the gravel remains.
If you frequently carry out a complete replacement of water and a thorough cleaning, then a stable environment will be disturbed each time and the aquarium will constantly require these procedures. Therefore, if the water often becomes cloudy, it is necessary, first, to check whether the filter performance is sufficient, and secondly, to colonize the aquarium with special bacteria (funds are sold to accelerate the maturation of the water).
Well, the aquarium in 50l is too small, IMHO it is better to put at least 100 liters. Then the environment in it will be more stable and less dependent on external factors. And do not overfeed the fish. and sometimes give them "fasting days" for about a week.

How many times to change the water in the aquarium

Yury Balashov

Ramazan, in a 20-liter aquarium of water is about 15-16 liters. It is necessary to replace, depending on the density of fish landing in 3-5-7 days, 10-15-20% of water. So consider that if you have overpopulation in an aquarium, then you need to change, for example, after 5 days, 20% water = 3 liters of settled water. temperature 1-2 * higher than in the aquarium. If everything is fine with the fish (in the sense of density), then 10-15% = 1.5-2 liters of water is enough once every 7-10 days. At the same time in the aquarium should grow a lot of plants, fish issued food, which will * eat for 1, a maximum of 2-3 minutes.
siphon
The main thing when changing the water of local residents is not to overlook!

Git + a

How often should I change the water in the aquarium?
After the aquarium is planted with plants and populated with fish, an amateur should strive to maintain a sustainable regime in it. For the normal development of fish and the prevention of a number of diseases, a certain chemical composition and biological equilibrium, maintained for many years, are necessary in water.
Water should be refilled as it evaporates, cleans the glass, the aquarium soil only partially, no more than 1/5 - 1/3 of the volume of the aquarium. Moreover, even a partial replacement of water should not drastically change both its gas and salt composition.
In aquarium fish farming, complete replacement of old water is extremely rare. Even with the massive death of fish it does not completely change. When completely replacing the water, it is necessary to be sure that the new water meets all the hydrochemical parameters required for the existing fish species.
Completely change the water in the aquarium in exceptional cases: when introducing unwanted microorganisms, the appearance of fungal mucus, rapid flowering of water that does not stop when the aquarium is darkened temporarily, and when the soil is very dirty. From the complete change of water plants suffer: there is discoloration and premature dying of the leaves. If the aquarium is biologically correctly populated, then plants, fish and bacteria in the soil and water can replace a good filter.
A common opinion among novice aquarists about the need for frequent water changes as a prerequisite for the normal maintenance of exotic fish is deeply mistaken. Frequent changes of water in the aquarium can cause illness and even death of fish.
In most cases, a water change — although a regular change of 1/5 of the water in an aquarium is always desirable — does not have a living stage of a room pond. This life in an aquarium, depending on our ability and desire, can last from several days to 10-15 years.
What does that require? Replacing water by 1/5, up to certain limits, of course, (topping up with non-living tap water) will shake the equilibrium state of the environment, but after two days it will be restored. The larger the aquarium, the greater the resistance in it against our inept interventions.
Replacing half of the medium will break the equilibrium stability, some fish and plants may die, but after a week the other homeostatism of the medium will again be restored.
Replacing all the water with a plumbing can completely destroy the environment, and everything will have to start over.
* If you decide to start an aquarium, and have not dealt with it before, but there is a desire to arrange everything not hastily and somehow, start with a small reservoir of 100-200 liters. It is just as easy to establish biological balance, to form a living environment, as in a small one, and to destroy it with its inept actions will be much more difficult than in an aquarium with a capacity of 20-30 liters.
In an aquarium, we do not contain aquatic animals and plants, but aquatic habitats, and the main task of an aquarist is to maintain an equilibrium, healthy state of this particular environment, and not its individual inhabitants, because if the environment is healthy, then the inhabitants of this environment will be well . The habitat in the period of its formation (when plants were planted in the ground, and a week later the first fish were launched) is extremely unstable, therefore it is strictly prohibited to interfere with the work of the aquarium at this time. What do we have to do?
Within two months, it is impossible to replace water: what's the point, instead of semidiving water, which is just turning into residential water, to bring in a sterile water supply again? In a large aquarium, changing water will slow down the formation of the habitat, while in a small aquarium this intervention will cause a catastrophe and everything will have to start over.
After two or three months, the emerging aquatic habitat in the aquarium will enter the youth stage. From this point until the complete reorganization of the aquarium, it is necessary to begin again to replace 1/5 of the volume of water once every 10 to 15 days, or monthly.

How often should I change the water in the aquarium ?? ? 35 liters

Svetlana Kuntysh

For most types of aquariums, water in the aquarium is enough to update! Every 7-10 days! At the same time, the remnants of food and garbage are removed from the bottom, about 1/5 of the water is drained and replaced with fresh, pre-settled water. A complete change of water in an aquarium is extremely rare in exceptional cases: when a fish is ill (for example). A complete change of water is equivalent to the launch of a new aquarium, with all the ensuing consequences.

Lt

Often you can not change in any case, the maximum every six months. they have no bio-balance from this, well, it's like a week to the desert, and the next to the tundra. Just pour in some water and collect dirt from the bottom.

Just Vasya

water in the aquarium is changed once a year. the rest of the time is made up with overflow water. In general, in order to balance the system it is desirable to have an aquarium larger than 60 liters. It is easier to handle. at full change, the water will still grow cloudy due to the development of microflora. another advice to wash the filter from the impeller but not to perfect purity, brown mucus is the useful microflora that processes organic matter. It is useful to do fasting days for fish. And try not to overfeed the fish.

How often should I change the water in the aquarium?

Catherine

Anna, I recommend you change the aquarium for a vessel of a larger volume (at least 50 liters) and a classic shape.
I understand that the displacement of your can is no more than 10 liters, and in such a volume it is extremely difficult to maintain normal water parameters! This is for professionals only, believe me. In such a volume, water should be replaced every day, think about whether you need such problems.
A filter is also required, it decomposes fish waste products into safe compounds. And so you have fish in this waste bathe. Imagine that a person is locked in a toilet with distorted mirrors and sometimes fed. Of course, over time, he will have nothing to breathe and the roof will go, and with fish.
In my opinion, from such an aquarium there is more trouble than pleasure.

Sheldon

It is impossible to change the water in the aquarium; you can only change it - about 1/5 of the volume of water once a week should be replaced with fresh 12 hours separated water (do not pour bottled water).
As for the aquarium, the larger the aquarium, the easier it is to create a self-regulating ecological system that requires minimal intervention. You can do without a filter, but it would be good to supply air with a compressor if the aquarium is small.

Majere

What fish? What volume? Is there any equipment? How many fish?
My roosters (each in the amount of 1.5-2 liters lives) change the water every 1-2 days, almost 70% of the tap, but they are accustomed from childhood to this, so the rest of this method will not work. Somam is changing once a week for 40% of water, but they have an aerator and filter.
It is impossible to wash all aquas (this is called a restart). Before the substitution can not be fed (especially delicate species of fish).
And do not forget about the siphon!

How often do I need to change the water in an aquarium of 40 liters?

Lidochka

Water in any aquarium needs to be changed once a week! When changing water, only one third of water needs to be changed! And if the water is changed once a year, the fish will die in their stool! - so transfer your mother-in-law!

AL UN

Changing the water in an aquarium is rarely necessary, for example, if a fish gets sick. You need to put the pump (filter) and wash it under running water without any detergents, depending on the pollution. Every two to three weeks you need to clean the soil with the help of a siphon or a hose with a suction method. If you have no soil, the water will become cloudy. Water should be added as necessary, preferably settled day in the amount of 15-25% at a time.

Lizard

You have a very small aquarium, it is difficult to establish a normal eco-system. Of course, there must be a compressor and a filter - this is a guarantee of the purity of the water. Fill the settled water as it evaporates, make sure that the algae do not grow (I’m not talking about plants, but about harmful algae such as nitrate and those that stick to the walls). And to change the water entirely - not at all necessary. It's like starting from scratch every time. In general, it is worth talking not about the change of water, but about partial substitution. Just see for yourself the state - is it necessary, substitution?
I still have a crumbling aquarium for 50 liters. The water is already yellowish-transparent, as it should, at the very least there is a bacterial balance, and I don’t need to change the water.
By the way, even if the fish died, the water can not be changed, but simply dripped Sulfur-Akutan, and the rest of the fish placed in quarantine. And ride for a sweet soul - I rolled.
In general, the rule is to look at the fish carefully every day - is there any sores on the skin, and in general, what is their mood. And do not overfeed, and the water from the feed can become cloudy.
Good luck.

ranja

Change the water weekly for 10-15 liters. Buy a siphon to clean the soil. Siphon the ground and at the same time drain some of the water (say 15 liters). Then pull out the internal filter (if it is clogged) and wash the sponge in the drained water (in no case in tap water). Fill the aquarium with clean settled water.

Lina

It is necessary to change once a week to 1/3. In general, the smaller the aquarium, the more the fuss with it. and once a year is simply unacceptable. the water balance is disturbed, the level of ammonium and nitrates increases, which undoubtedly leads to the death of not only fish, but also of all living things.

How often should I change the water in a round aquarium?

Tiamatra

In the round aquarium scrofula will not live long. Water in normal aquariums changes completely only in the event of a restart. Change the "jar", put a powerful filter (both internal and external) and replace 30% of the water in it by draining these percentages during the siphon.

Kate filonova

As often as aquariums with improved mechanical filtration, since only good external filters can be called true filters.For a herbalist with a large number of plants, the weekly amount of substitutions is 10%, for a mixed aquarium with plants and a large number of fish - 20%. If we consider a spherical capacity with one cock, without plants, then I think at least 30-40% per week. Yes, more than 40% of the substitution is also not worth it, so as not to destroy the delicate balance of the biological system

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